Comment by imakesnowflakes

I once implemented a simple back propagation algorithm in Haskell (without any libraries) that could identify the pattern (one amoung 'A', 'B', 'C' or 'D') represented on an 8x8 matrix...

Here is the code..

https://bitbucket.org/sras/haskell-stuff/src/b58f3fc017ce303...